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34 * From: @(#)strtoul.c 8.1 (Berkeley) 6/4/93
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/ctype.h>
43 #include <sys/limits.h>
46 * Convert a string to an unsigned long integer.
48 * Ignores `locale' stuff. Assumes that the upper and lower case
49 * alphabets and digits are each contiguous.
52 strtoul(const char *nptr, char **endptr, int base)
58 int neg = 0, any, cutlim;
61 * See strtol for comments as to the logic used.
71 if ((base == 0 || base == 16) &&
72 c == '0' && (*s == 'x' || *s == 'X')) {
78 base = c == '0' ? 8 : 10;
79 cutoff = (unsigned long)ULONG_MAX / (unsigned long)base;
80 cutlim = (unsigned long)ULONG_MAX % (unsigned long)base;
81 for (acc = 0, any = 0;; c = *s++) {
87 c -= isupper(c) ? 'A' - 10 : 'a' - 10;
92 if (any < 0 || acc > cutoff || (acc == cutoff && c > cutlim))
105 *endptr = __DECONST(char *, any ? s - 1 : nptr);